The U.S. National Fungus Collections (BPI) is a mycological institution that includes the world's largest herbarium of dried fungus specimens, together with technical reference literature and data files. It is a base for research and service in national and international mycology and plant pathology. Many of the technical resources and specimen data are available online.
The J.A. Stevenson Mycological Library is a non-lending collection of journals, books, and reprints relevant to the systematics of fungi with emphasis on those of agricultural importance. Continuously growing, the library consists of about 450 historical and modern mycological journals, of which 45 are currently being received. The books number about 4,000 including a number of rare titles that date back to 1675. The reprint collection is estimated at about 20,000 and includes only reprints not found in the journals. As references are added, those of most importance are entered into a database of literature useful for the identification of plant pathogenic fungi. This database consists of about 33,000 records, each with keywords including fungus and host.